#include <algorithm>
#include <complex>
#include <iostream>
#include <vector>
 
void println(const auto& seq)
{
    for (const auto& e : seq)
        std::cout << e << ' ';
    std::cout << '\n';
}
 
int main()
{
    std::vector<int> v{0, 1, 2, 3, 4, 5};
 
    // set all elements to -1 using overload (1)
    std::ranges::fill(v.begin(), v.end(), -1);
    println(v);
 
    // set all element to 10 using overload (2)
    std::ranges::fill(v, 10);
    println(v);
 
    std::vector<std::complex<double>> nums{{1, 3}, {2, 2}, {4, 8}};
    println(nums);
    #ifdef __cpp_lib_algorithm_default_value_type
        std::ranges::fill(nums, {4, 2}); // T gets deduced
    #else
        std::ranges::fill(nums, std::complex<double>{4, 2});
    #endif
    println(nums);
}